Can't remember now if it was a radio person or non-radio person who told me that, back in the day when Celsius first replaced Fahrenheit for temperatures in Canada, they always knew which temperature scale radio announcers were using by how they said winter temperatures. "Two degrees below zero" was Fahrenheit, while "Minus Two" was Celsius. With "above" and "plus" also used in the winter in the Prairies.

I'm trying to think back to my High School Physics. Even though it would be another decade before Canada switched to Metric, everything in Physics was Metric. For temperature, it was Minus and Plus, and never Negative. Only in Math and Arithmetic did we ever use the term "Negative".

Speaking of Fahrenheit, some stations with older audiences were still giving temperatures in both Celsius and Fahrenheit a decade or more after the change came in Canada. Canada's "sorta" conversion really confuses immigrants. With the exception of a few government buildings, Construction is still done in Feet and Inches. And ovens are still in Fahrenheit.

Lately listening to pre-recorded weather bumpers on stations like CKBL and CKGY the announcers seem to just omit the negative entirely and say it's 22 or 26 when running through various locales quickly within the allotted time, with the understanding that it's -22°C not +22°C. Perhaps it's like when morning shows announce the time without mentioning AM or PM, likely with the day or night part understood by most of the listening audience.

Is this exciting because Vancouver gets their once a year taste of winter? Haha

Environment Canada (and Nav Canada) use STR StarCaster on their VHF WeatheRadio (and ATIS) broadcasts ... the system gets quite glitchy at times and doesn't always concatenate speech correctly, resulting in some anomalies such as "and and" being broadcast. The same recordings are heard on their WeatherLine service. https://www.ec.gc.ca/meteo-weather/defa ... B76F4495-1

Early in my career I was told by Environment Canada that in Metric temperatures below the freezing mark were to be called "minus". Above freezing, just the number. No, "plus". No "negative" or "positive" in either case. I see no reason to change that now. Sometimes rookie announcers strive to be creative and different by going with what they consider to be unique without realizing that either, it's been done before or, it's just plain wrong.